..  .  #   ##                    
     . . (.  .#  .                     
    .  #X.(##%. >                      
        ((hX .#(#                      
     ...#X#X .#.                       
       .  XX .(.                       
         . h#.                         
           #A#                         
           #(#                         
           ###                         
                                       
                                       
                                       
                                       
         ∆